I have a thought on this and I will try it out when I get home. Getting some plumber's Thread Seal Tape, it's a teflon tape that isn't sticky and is extremely thin, you could wrap the ball at the shoulder and insert it back into the torso. Might work wonders...I'll let you know. Save some money not having to replace torsos or arms.

I play with Lego because professional architectural creativity is stifled by bureaucrats, fools and reality.